package com.zzyl.framework.interceptor;

import cn.hutool.core.map.MapUtil;
import cn.hutool.core.util.ObjectUtil;
import com.zzyl.common.utils.StringUtils;
import com.zzyl.common.utils.UserThreadLocal;
import com.zzyl.framework.web.service.TokenService;
import io.jsonwebtoken.Claims;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @author zzw
 * @date 2025/6/3
 * @description 小程序端拦截器
 */
@Component
public class MemberInterceptor implements HandlerInterceptor {

    @Autowired
    private TokenService tokenService;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
                             Object handler) throws Exception {

        // 如果不是Controller层的请求，直接放行
        if (!(handler instanceof HandlerMethod)) {
            return true;
        }

        // 获取token
        String token = request.getHeader("authorization");

        // 如果token为空，返回401
        if (StringUtils.isEmpty(token)) {
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            throw new RuntimeException("认证失败！");
        }

        // 如果token解析失败，返回401
        Claims claims = tokenService.parseToken(token);
        if (ObjectUtil.isEmpty(claims)) {
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            throw new RuntimeException("认证失败！");
        }

        // 如果userId为空，返回401
        Long userId = MapUtil.get(claims, "userId", Long.class);
        if (ObjectUtil.isEmpty(userId)) {
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            throw new RuntimeException("认证失败！");
        }

        UserThreadLocal.set(userId);

        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler,
                                Exception ex) throws Exception {
        UserThreadLocal.remove();
    }
}
